Engine appearance questions

Also, I want to replace some of my pulleys, but can't figure out what the (2) little pulleys between the A/C and the crankshaft pulleys are.
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so I disconnect it at the air pump. What about the rest of the hose(s) connected to the engine. I'd have to take out those, too. And what about setting off any codes?
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Suck you gotta keep the AIR system